code: def get_background_rank_df(cls, frequency_path=None):
      return cls.prep_background_frequency(
          cls.get_background_frequency_df(frequency_path)
      )
  
file_path: scattertext/scattertext/frequencyreaders/DefaultBackgroundFrequencies.py
imports: import pkgutil
  from io import StringIO
  import pandas
  from scipy.stats import rankdata
label_desc: Use image node_id 2 for calling the BackgroundFrequencies obj's underlying member method code with example usage: obj.get_background_rank_df(cls, frequency_path) and returns: cls